Dimensions of DSM-5 Posttraumatic Stress Disorder (PTSD) Symptoms

Abstract

Introduction

Despite the four factor model of PTSD proposed in the DSM-5 (APA, 2013) has received a better empirical support than three factor model of DSM-IV (APA, 1994), some alternative models proposed can provide a better representation of PTSD's latent structure.

Objective

The current study tested the fit of seven models, including the 3-factor DSM-IV model (APA, 1994), the 4-factor DSM-5 model (APA, 2000), the 4-factor dysphoria model (Simms, Watson & Doebbeling, 2002), the 5-factor dysphoric arousal model (Elhai et al., 2012), the 6-factor anhedonia model (Liu et al., 2014), the 6-factor externalizing behaviors model (Tsai et al., 2014) and the 7-factor hybrid model (Armour et al., 2015) that combines key features of the anhedonia and externalizing behaviors models.

Aim

It expected that the 7-factor hybrid model (Armour et al., 2015) would be the best fitting model.

Methods

PTSD symptoms were assessed using the Global Assessment of Posttraumatic Stress Disorder (EGEP-5; Crespo, Gómez & Soberón, 2016) in a sample of 165 victims of different traumatic events. Confirmatory Factor Analysis (CFA_s) were conducted on each of the seven models using Maximum Likelihood (ML) estimation method.

Results

All the models tested (except for DSM-IV model) yielded an adequate fit to the data. However, 7-factor hybrid model (Armour et al., 2015) provided a better fit than other competing models.

Conclusions

The current findings suggest that the dimensional structure of DSM-5 PTSD symptoms may be best represented by the 7 factors proposed in the hybrid model instead of 4 factors of DSM-5.

References not available.

Disclosure of interest

The authors have not supplied their declaration of competing interest.